electric automobile vs motorcar

electric automobile and motorcar both are nouns.

Word	Noun	Adjective	Verb	Adverb
electric automobile	Yes	No	No	No
motorcar	Yes	No	No	No

As nouns, motorcar is a hypernym of electric automobile; that is, motorcar is a word with a broader meaning than electric automobile:

electric automobile: a car that is powered by electricity
motorcar: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of electric automobile include auto, automobile, car, machine.

electric automobile (noun)	motorcar (noun)
a car that is powered by electricity	a motor vehicle with four wheels; usually propelled by an internal combustion engine